What Is a Propeller Shaft?
A propeller shaft is a device on which a propeller is attached to and transfers the power from the engine to the propeller. This terminology is typically used when discussing a ship or boat propeller as an airplane’s version is typically mounted to a hub. The propeller shaft runs from the engine through a seal in an inboard engine application. It then runs through the hull and into a bearing just ahead of the propeller. The propeller shaft must run true and straight, free of any bends or it will vibrate the vessel as well as pre-maturely wear out the bearings and seals.
